A dense and homogenous flat wide-bandgap (1.75 eV) CH3NH3PbI2.1Br0.9 perovskite film was prepared via a facile halide exchange route. The planar-heterojunction solar cell shows an optimal power conversion efficiency of 12.67% with negligible current hysteresis due to the film's large grains and vertically oriented grain boundaries.
Real-time electromagnetic transient simulation system involves high computational tasks and is very difficult to achieve small time step. In this paper, we proposes the field programmable gate array (FPGA) design and implementation for real-time electromagnetic transient simulation system with double-precision floating-point calculation. The parallel… (More)
This paper presents a mixed topology of Power Electronic Transformer based on Three-Level converter and H-Bridges. It does take into account two conditions, which includes the development of power electronic devices and manufacturing level of high-frequency transformer in the future. First the paper introduced the fundamentals of PET, and then studied on… (More)
Because of the large-scale integration of wind power, dynamic characteristics of power system emerge a lot of uncertain influence. Only considering the most serious and credible accidents, traditional on-line security assessment system which is based on deterministic analysis methods can not quantitatively estimate the actual operating conditions of power… (More)